JPH02105397A - Sound recorder and reproducer - Google Patents

Abstract

PURPOSE:To perform the sound recording jobs in accordance with the elements like the sound quality, the source recording time, etc., by controlling a variable frequency oscillator via a time base generator and using fully the memory elements at recording. CONSTITUTION:A reference generation/sound record-reproduction controller 12 controls a divider/selector 8 and also controls as necessary the clocks and the control signals which are applied to the amplifiers 2 and 6, an A/D modula tor 3, the memory elements 4, and a D/A demodulator 5. In the case all elements 4 are empty, a comparator 11 compares the time base of the selector 8 with that of the controller 12. Then an optimum clock is supplied from an oscillator 9 via the selector 8 for use of all elements 4. In the case a sound recording state where all elements 4 are used is changed to the 1/n capacity, a recorded time base is inputted to the selector 8 from the controller 12. Then the storage recorded by a 1/n clock is stored again within the storage of 1M. Therefore 2M - nM are used for the following recording jobs, and the memory transfer is operated again in the M2 in the same way.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording/playback device, and more particularly to a recording/playback device using an analog/digital modulator, a digital/analog demodulator, and a storage element.

[Conventional technology]

Conventionally, such a recording/playback device converts an input analog signal into a digital signal during recording and stores it in a storage element based on a frequency divider or selector, while during playback, it reads out the digital information stored in this storage element and converts it into an analog signal. The signal is demodulated and made into audio. The capacity and clock of the memory element used in this recording/playback device are all fixed.

FIG. 3 is a block circuit diagram of a recording/playback device for explaining an example of the conventional technology.

As shown in FIG. 3, in this recording and reproducing apparatus, first, during recording, an audio signal from an input terminal 1 is amplified by an amplifier 2 to a level necessary for modulating an analog signal into a digital signal. Then, analog
This digital signal output modulated into a digital signal by the digital modulator 3 is stored in the storage element 4 under the control of a frequency divider or selector 8.

On the other hand, during playback, the digital signal read out from the storage element 4 under the control of the frequency divider or selector 8 is demodulated into the original analog audio signal by the digital-analog demodulator 5, and then amplified by the amplifier 6. The loudspeaker 7 is driven.

Here, regarding the control clock sent from the frequency divider or selector 8, the oscillation output of the oscillator 9 is sent to the frequency divider/selector 8, and the output of the oscillator 9 is sent to the frequency divider/selector 8. The selection signal of this frequency divider/
Controls selector 8. Therefore, clocks corresponding to recording and playback are transmitted to analog-digital modulators 3 and 3, respectively. A storage element 4' and a digital-to-analog demodulator 5 are supplied.

[Problem to be solved by the invention]

In the conventional recording/playback devices mentioned above, the clock cycle and memory element capacity are fixed, so depending on the length of the input source, there may be insufficient recording time, or if you want to record with emphasis on sound quality, the clock may be fixed. The disadvantage is that the sound quality may deteriorate because of this.

An object of the present invention is to provide a recording/playback device that can perform recording that is suitable for the sound quality and recording time of the input source.

[Means to solve the problem]

The recording/playback device of the present invention includes a modulator that converts an analog signal into a digital signal, a memory element that can write and read the converted digital signal at any time and has a fixed capacity, and a memory element that converts the memory element into a recording time. Regardless of the input signal recording time, the recorded signal is thinned out and shortened to a part of the memory element and re-recorded, and the remaining memory element part is used for new recording, and the series of It is configured to include a control circuit that can control the operation multiple times, and a demodulator that demodulates the digital signal into an analog signal.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block circuit diagram of a recording and reproducing apparatus for explaining a first embodiment of the present invention.

As shown in FIG. 1, in such a recording/playback device, an analog signal supplied from an input terminal 1 during recording is amplified by an amplifier 2, converted to a digital signal by an analog-digital modulator 3, and then stored in a fixed capacity storage element. Written to 4. Further, the digital signal read out from the storage element 4 during reproduction is converted into the original analog signal by the digital-to-analog demodulator 5, amplified by the amplifier 6, and then outputted from the loudspeaker 7. The fixed capacitance storage elements 4 described above are IM and 2M-(n-1)M, respectively.

nMc, where n and M are integers].

On the other hand, during recording or playback, a clock signal for controlling the storage element 4 and each device is supplied from a frequency divider or selector 8, and the output of a variable frequency oscillator 9 is supplied to this frequency divider/selector 8. be done. Further, the time base of the time length of the analog signal supplied from the input terminal 1 is generated from the reference generation/recording/playback controller 12, and the time base from the frequency divider/selector 8 is connected to the comparator 11.
- A variable frequency oscillator 9 that outputs error correction and selects a frequency divider or selector 8 by comparing at
control. That is, the reference generation/recording/playback controller 12 controls the frequency divider/selector 8, and depending on the recording or playback situation, the amplifiers 2 and 6, and the analog-digital modulator 3.
．． It controls the clock and control signals from the frequency divider/selector 8 that are supplied to the storage element 4 and the digital-to-analog demodulator 5. Furthermore, the memory time base input from the frequency divider/selector 8 to the comparator 11 differs depending on the usage status of the storage element 4 from IM to nM. Assuming that all the memory element areas are now vacant, a corresponding memory time base is input to the comparator]1 and compared with the input signal time base from the reference generation/recording/playback controller 12. As a result, the optimum oscillation frequency that uses up all of the storage element 4 from IM to nM is generated by the variable frequency oscillator 9, and then passed through the frequency divider/selector 8 to the analog-digital modulator 3. Storage element 4 and digital analog demodulator 5
The optimal clock is supplied to

Next, if you want to use all the storage capacity from IM to nM of the storage element 4 and transfer the recorded data to the I/N capacity as a mere memo, the recorded time base is transferred from the reference generation/recording/playback controller 12. By inputting this into the frequency divider/selector 8, the storage capacity range recorded by the 1/n clock is re-recorded within the storage capacity of the IM as having been thinned out to 1/n. Therefore, the next recording will be recorded using the storage capacity from 2M to nM, and the memo transfer will be re-recorded to 2M in the same way. However, the more notes you take, the smaller the recording capacity becomes.

FIG. 2 is a block circuit diagram of a recording and reproducing apparatus for explaining a second embodiment of the present invention.

As shown in FIG. 2, this embodiment uses two sets of the circuits shown in the first embodiment described above, but in this case, the variable frequency oscillator, the comparator 11, and the reference generation/recording/playback controller 12 are shared. In addition, a new mixer/switcher 21 and a switch 22 are added to the structure.

In such a recording/playback device, when the input signal is stereo and both input terminals 1 and 31 are used, switch S1. ．． 33 is connected to a, and the switch Sll of the changeover 22, 333 is connected to a, and the variable frequency oscillator 9. Comparator 11. Standard occurrence/
Although the recording/reproducing controller 12 is shared, the operation is the same as the circuit of the first embodiment. In addition, if the same signal is input to input terminals 1 and 31 with monaural input, or if the input signal is input to one side of input terminal 1 or 31, it is stored by switch S2 of mixer/switcher 21 and switch 822 of switch 22. There is an advantage that elements 4 and 34 can be switched in series and used continuously, and twice the recording time can be secured with the same sound quality.

〔Effect of the invention〕

As explained above, the recording and playback device of the present invention controls the variable frequency oscillator with the time base generator so that the memory element is fully used during recording, thereby adjusting the sound quality and recording time of the source. This has the effect of making suitable and optimal recordings possible.

Another advantage of the present invention is that after recording and playing back something that emphasizes sound quality, such as a song, it can be re-recorded in a part of the memory element like a lyrics card, and most of the remaining capacity can be used for new recordings. .

Analog demodulator 1.7... Loudspeaker, 8... Frequency divider/selector, 9... Oscillator, 11... Comparator, 12...
Reference generation/recording/reproduction controller, 21...mixer/switcher, 2
2...Switcher.

Claims (1)

[Claims] a modulator that converts an analog signal into a digital signal; a memory element that can write and read the converted digital signal at any time and has a fixed capacity; A control circuit that can match and use up the recorded signal, thin out the recorded signal, shorten it to a part of the storage element, and re-record it, use the remaining storage element part for new recording, and control the series of operations multiple times. and a demodulator that demodulates the digital signal into an analog signal.